Abstract:
Mesobdella lineata, a small terrestrial species of leech from southern Africa, originally placed
in the family Haemadipsidae, is redescribed based on internal and external morphological characters
of the holotype and of additional material collected in 1975. The placement of this species
in the South American genus Mesobdella on the basis of seemingly triannulate midbody somites
is found to be erroneous as midbody somites are five-annulate. Mesobdella lineata has neither the
midventral nephridial pore, a synapomorphy of Xerobdellidae, nor the posteriolateral auricles of
Haemadipsidae. With a caudal sucker that is wider than the four most posterior somites of the
body, eight teeth per jaw, micromorphic median reproductive structures, and no postanal annuli,
this species is placed in the mammalophilic family Praobdellidae. A morphological matrix of 32
characters was analyzed with parsimony and implied weighting. The new genus Parapraobdella
is warranted to accommodate the unique combination of characters of the species that is morphologically
similar to Neotropical representatives of the family.
